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- Title
A Combined Data Processing Method on Water Impact Force Measurement.
- Authors
Zhao, Meng-hua; Chen, Xiao-peng
- Abstract
A combined method is proposed to determine the water entry acceleration at a low impact velocity through image processing. The procedure includes: (1) a sequence of images for water impact are recorded by a high speed camera, (2) the sub-pixel image processing method is employed to calculate the displacement with an accuracy on the “sub-pixel” level, (3) the acceleration of the object is acquired by differentiating the displacement twice and with results being further filtered by a carefully designed low-pass Butterworth filter. A theoretically based analysis is conducted for designing the parameters of the low-pass filters. It is shown that the water entry can be regarded as a procedure with a slowly changing velocity. The method is validated with the standard sinusoidal motion and the water entry of a sphere. This approach could be considered as an auxiliary method during the early-stage study of the water entry, and it could be further applied to some complicated circumstances, like the water entry of spinning spheres.
- Publication
Journal of Hydrodynamics, 2012, Vol 24, Issue 5, p692
- ISSN
1001-6058
- Publication type
Article
- DOI
10.1016/S1001-6058(11)60293-X